Stop for phonographs



R. BAHTOLQMH. STOP FOH PHQNQGRAPHS APPLICATION FILED SEPI. 8. 1920.

Patented Mar. 1, 1921. v

y INI/Enron vUNITED STATES PATENT OFFICE.

:RICARDO BARTOLOMH, 0F NEW YORK, N. Y.

STOP FOR PHONOGRAPHS.

Specification of Letters Patent.

Patented Mar. 1, 1921.

Application filed. September v8, 1920. Serial No. 408,801.

vices have been placed upon the market with a view of providing a stop which would be actuated automatically upon the reproducer reaching the last groove of the record. A

These devices, although positive in operation, have left much to be desired in that it has been incumbent upon the operator of a machine to set the automatic stopping device so that a brake would be exerted upon the stylus of the reproducer traversing the last groove of the record, or those grooves adjacent the same.

This was necessary, due to the fact that each record varies with respect to the'number of convolutions of the spiral groovein its face, consequently the reproducing groove in certain types of records terminates at a point but one inch removed from the outer edge of the record, while in other cases, the groove is continued to a point adjacent the edge of the label commonly placed at the center of the record.

Having this defect in mind, I have n ow invented a stop for phonographs which shall be entirely lautomatic in operation, in that it will not be necessary to insure the stoppage of the turn table upon the stylus of the reproducer traversing the last portion of the groove in the face of the same.

By this construction it will readily be appreciated that an entirely automatic result will be achieved, in that it will only be necessary to place the record upon the turn table, and set the latter in motion, subsequent to which the stylus of the reproducer is introduced to the initial groove upon the face of the record in the usual manner, to

insure the automatic stoppage upon the reproduction being completed.

Reference is had to the attached sheet of drawings as illustrating'l one 'bodi'ment of my invention, an fin which-.

Figure 1 is a bottom plan lview. of a turn ratical eintable and its associated parts, constructed in accordance with my invention. f

Fig. 2 is a sectional sideiview taken alon the lines 2--2 of Fig. 1, and

Fig. 3 is a top plan view of a turn table,

and showing a record applied thereto in -accordance with my invention.

In these views the reference numeral 5 indicates the base, which may be conventional in construction, and uponl which a turn table6 is rotatably supported by means of the motor shaft 7 such turn table in turn receiving the conventional disk record 8 in sound grooves 9 of which a reproducer 10 travels. y

Contrary to the conventional construction however, it will be noted that the record 8 is conveniently formed with a cut-out portion 11, which cut-out portion, as will be noted in Fig. 3, is in the form of an arc of a circle having as its center the apex of the motor shaft 7 n i The turn table 6 is also formed with a cutout portion, which latter portion is adapted to be brought into alinement with the cutout portion 11 of the record. v

A plate 12 is normally supported in the cut-out portion of the turn table 6 by means of a spring actuated lever 13, associated with the under-side of the turn table 6, in

which position it is pivotally supported, as

has been indicated by the reference numeral 14. In this connection, it is to be noted that the plate 12 conveniently conforms to an arc similar to that of the cut-out portion 11 of the record 8, with the exception that the plate 12 covers a greater area than the last cutout portion.

A braking device conveniently co-acts with the turn table 6, and upon being actuated serves to support the same. This brake preferably includes a lever 15, which is pivotally supported, as at 16, upon the base 5, it beingl noted that one end of a contraction spring 17 is attached to the lever beyond its point of pivotal association with the base in such a manner that the lever will be retained in either of its extreme positions past dead center.

A contact member 18 conveniently forms a part of the lever 15, and such Acontactmember is adapted to be brought to bear by means of the spring,"as has been indicated in dottedv lines against a convenient'portion of the turn table 6, whereby to cause a cessation of operation of the latter'.

As has been illustrated in Fig. 2, the spring associated with the lever 13 serves to normally retain the outer end of the latter in a plane at whichV the same Will be out of the path of travel of the inner en d of the lever 13. `However, upon the stylus of the reproducer 10 entering the cut-out portion 11 of the recordlas hasbeen indicated. in p' dotted lines in Fig. 2) and bearing against the.plate 12, the lever will bel depressed to the position also indicatedvin dotted .lines` in this figure, Which 'Will result in the outer end of this lever being swung to a position at which, upon the next revolution ot the turn table,\the\inner end of theA `lever 15 will be engaged, and the latter Will Vbe swung past dead center to the 'position indicated in dotted lines in Fig. 1., which, as will obviously be appreciated, Will 'serve to .bring the, turn tableto a stop. s

In this connection it Will be noted that the lever 15 Amay be reset, by virtue of'that portion of the same `extending beyond its point ofV pivotal connection, Which Will permit of the manual operation ofthis latter, as Wellas the re-setting of the same aforementioned-` r l v Obviously numerous modifications of struc-4 ture might readily be resorted to vvithoutin the least departing from the spirit of my invention, Which' I claim as-l l 1. A stop for talking machines, including a turn table, a recor adaptedto be Vposi-V tioned upon said turn table, said record being formed with an opening, a reproducer adapted to traverfsethe sound grooves of said record, the last sound groove of said record communicating With said cut-out portion, a brake, and means connected to said turntable lfor actuating saidbrake When the stylus of said reproducer moves into the cutout portion of said record.

2.-Astop for talkingmachines, including a turn table, a record adapted to be positioned upon saidy turnv table, said record being formed with an opening, a reproducer adapted to traverse the sound grooves of said record, the last sound groove of said record communicatingvvith said cut-out portion, a brake, a plate movably positioned' with anV opening forminga vpart of said turn table, said plate being adapted to `directly underlie the cut-out portion'of the record, and means connected with said plate,`

for actuating lsaid brake v'vhen the stylus of'- said reproducer moves into the cut-out por# tion of the record and contacts With same.

3. A stop for talking machines, including in combination With a turn ltable formed with a cut-out portion, a record also formed With a cut-out portion and adapted to be. placed upon said turn table, the cut-out portions both alining, a lever, `a plate connected to the end of said lever, Ameans, for

normally holding said lever so that the plate is normally held in position Within the cutvRICARDO, BAnToLoMH.

,out portion of the turn table, aV brake for a i 7 5 

